Adding-machine.



PATENTED MAY 9, 1905.

W. P. GATE-WOOD.

ADDING MACHINE.

APPLICATION FILED JULY 6,1904.

2 SHEETS-SHEET 1.

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v Inventor Httomegs Witnesses PATENTED MAY 9, 1905.

W. P. GATEWOOD.

ADDING MACHINE.

APPLICATION FILED JULY 6,1904.

2 SHEETS-SHEET 2,

Inventor r I Httornegs WZiz'a/wikiewaafi Witnesses a UNITED STATES Eatented May 9, 1905.

PATENT OFFICE.

ADDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 789,688, dated May 9, 1905.

Application filed July 6, 1904. Serial No. 215,503-

To (bi/Z 1071/0771 it ntay concern.-

Be it known that LIVILLIAM F. GArEwooD, a citizen of the United States, residing at Pierce City, in the county of Lawrence and State of Missouri. have invented a new and useful Adding-Machine, of which the following is a specification.

This invention relates to adding-machines, and has for its principal object to provide a machine of extremely simple and economical construction by which columns of figures may be added with accuracy and despatch.

A further object of the invention is to provide a novel form of adding-machine in which a revoluble adding-disk is combined with a keyboard in such manner that the depression of any key will stop the rotation of the disk at any desired point, the disk receiving an angular movement to an extent determined by the amount represented by the key depressed.

A still further object of the invention is to provide a normally locked spring-actuated adding-disk which is unlocked on the depression of each key and is thence carried by its spring until stopped by the key or a member operable by said key.

A further object of the invention is to provide improved means for eifecting the looking and unlocking of the disk.

A still further object of the invention is to provide a novel form of transfer mechanism by which the movement of the main disk is transmitted to an auxiliary disk for designating a higher row of numerals.

With these and other objects in view the invention consists in the novel construction and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size, and minor details of the structure may be made without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawings, Figure l is a perspective view of an adding-machine construction in accordance with the invention. Fig. 2 is a transverse sectional elevation of the same. Fig. 3 is an inverted plan view of a portion of the mechanism, illustrating more particularly the construction of the transfer device. Fig. 4 is a detail sectional view on the line 4 4 of Fig. 3. Fig. 5 is an elevation, partly in section, looking from the right of Fig. 1. Fig. 6 is a similar view of a portion of the same, illustrating the parts in different position. Fig. 7 is adetail sectional view on the line 7 7 of Fig. 5. Fig. 8 is a detail view illustrating the mechanism for limiting movement of the disk-engaging arm to initial position.

Similar numerals of reference are employed to indicate corresponding parts throughout the several ligurcs of the drawings.

The working parts of the machine are supported in a suitable base 1, which may be formed of wood or metal or a combination of both. Arranged above and parallel with the base-plate is a cross-bar or plate 2, having downwardly-bent end portions that are secured to the base-plate. The base-plate and cross-bar carry bearings for the reception of a vertically-disposed threaded shaft 3, to which is secured an adding-disk 4 and a small handle 5, the latter being employed in turning the disk to initial position and in rewinding the actuating-spring of said disk. The lower end of the threaded shaft extends down through an opening in the base-plate and is secured to the inner end of a spiral spring 6, the opposite end of which is secured to the wall of a stationary casing 7, that may form a part of the base structure, and said spring at all times tends to turn the disk in the direction indicated by the arrow; but the disk is normally held from movement by a locking means that is released each time a key is depressed.

In order to avoid overwinding of the spring, as well as to insure its rewinding at proper intervals, the threaded shaft extends through a threaded opening in an arm 8, the outer end of which is provided with an opening for the passage of a vertically-disposed guiding-pin 9, and on said arm is a pin or lug 10, with which may engage an arm 11, firmly secured to and revoluble with the shaft 3. IV hen the spring has been fully wound, the arm will engage the lug and prevent further winding, and as the spring continues to unwind during the progress of a calculation the arm 8 will gradually come into contact with the base or other fixed point and prevent further movement until the spring has been rewound and the arm 8 elevated to such position that the lug 10 may be again engaged by the arm 11.

The disk carries numerals from 00 to 99 and has a corresponding annular row of openings 13. The numerals are displayed through an opening 14, formed in the crossbar, and this opening serves also for the display of numerals from 0 to 9 on a secondary disk 15, mounted on a pivot-pin 16, depending from the crossbar 2. On the under surface of the disk are dependent pins 16, ten in number and adapted to successively engage with a notch 17, formed in one arm of a spring-held bell-crank lever 18, that is pivoted to the under side of the cross-bar and is suitably guided by a slotted dependent pin 19, carried by the cross-bar. The main disk 4 has a projecting tooth 20, which passes above the bell-crank lever once during each revolution of the main disk and engages with the pin 16, that is held in the notch 17, and effects revoluble movement of the secondary disk 7 to the extent of a single tooth. Each complete revolution of the main disk will register or indicate 100, and after 99 has been displayed by the main disk the further turning of said main disk to the extent of a single number will cause the partial turning of the secondary disk to display 1 on the secondary disk and 00 on the main or primary disk.

To the base is secured an arcuate bar 20, and to said bar are secured a number of vertically-disposed radiating ribs 21. To each of these ribs is pivoted a key-lever 22, having at its outer end a key 23 bearing a numeral. In the present case the numerals run from 1 to 18, and the keys are in two rows. the odd numbers in one row and the even numbers in the other. This permits of more rapid adding, inasmuch as two nines may be added simultaneously by the depression of key 18 or three sixes or any other combination of numbers may be mentally added to form a sum equal to that represented by one of the higher keys and simultaneously added by depression of such key. The inner ends of the key-levers are normally held depressed by small torsion-springs 24:, the lower ends of which are secured to a cross-bar 25. At the extreme right of the keyboard is a standard 26, to the upper end of which is secured a spring-finger 27, having at its outer end a pin 28 for engagement with the successive perforations 13 in the main disk. The pin has an inclined lower face, so that normally it will prevent rotative movement of the disk in the direction indicated by the arrow, but will not prevent turning of the disk by the handle in the opposite direction during the restoration of said disk to initial position and the rewinding of the actuating-spring.

The standard 26 and an auxiliary standard 30 at the opposite side of the keyboard serve as supports for the extended arms 31 of an arcuate bar 32, that extends across the keyboard at a point immediately above the inner ends of the key-levers. To this arcuate bar is connected the outer end of a stop-arm 31, the inner end of said arm being provided with a hub portion mounted on an unthreaded portion of the vertical shaft 3. The outer end of said arm is bent in such manner as to embrace the arcuate bar 32, but is free to slide to and fro on said bar during the operation of the machine. The arm 3 is formed of semi-elastic material and normally tends to hold the bar down with thearms 31 engaging against stop-lugs 35, carried by small standards 36 at the opposite sides of the keyboard. The inner portion of the arm 34 is engaged by one end of a torsion-spring 38, the opposite end of which is secured to the lixed pin 9, and this torsion-spring serves under normal conditions to retain the outer end of arm 34 in engagement with the arm 31 at the left of the keyboard. Arm 34L carries an upwardly-projecting pin 39, which may be inserted in any one of the row of perforations in the disk and when so interlocked with the disk will be carried by the latter until the outer end of the arm engages against the inner end of one of the key-levers. the extent of such movement being of course dependent on the key-lever depressed.

The bar 32 is provided with a depending member 40 for the support of a small rockshaft 4C1, from which projects a pawl or tooth 12, adapted to engage with the row of perforations in the main disk, and this rock-shaft is yieldably mounted, being held by a spring 43, so that the tooth will be free to move to permit the turning of the main disk in the direction indicated by the arrow during the progress of the calculation, but will prevent its turning in the opposite direction. The cross-bar 32 is further adapted to engage a lug 4K3, depending from the disk-locking arm 27. and upward movement of said cross-bar is limited by means of projecting lugs 41, carried by the small standards on the opposite sides of the keyboard.

In the operation of the device the disk is turned in the direction of the arrow until all of the zero-marks are opposite the displayopening. A linger-key representing the lirst number to be added is depressed and the inner end of said finger-key is moved upward. engaging the bar 32 and the latter carrying with it the outer end of the arm 34, pin 39 of said arm coming into engagement with one of the perforations on the main disk. At the same time the cross-bar engages the lug depending from locking-spring and raises the locking-pin of the latter from engagement with the perforations. This movement further causes the locking-tooth 42 to move upward into engagement with the perforations. The actuating-spring secured to the screwshaft is much stronger than the torsion-spring 38, so that when released from the lockingspring 37 the disk is rotated in the direction of the arrow until the outer end of the arm 34 engages against the end of the key-lever actuated and is stopped, and the extent of this movement and the corresponding angular movement of the main disk depends on the position of the key-lever. During this operation the lower tooth 42 will engage the successive perforations as they pass and will serve finally to engage with one of the perforations and prevent return movement of the disk. When pressure on the finger-key is relieved, the spring-arm 44 will force the crossbar 32 downward until pin 39 of the arm is out of engagement with the perforation, and thereupon the arm 34 will be restored to its initial position by means of the torsion-spring 3 At the same time the downward movement of the cross-bar permits the arm 27 to descend until its locking-pin is again engaged with the perforation and the disk is locked in the position to which it has been adjusted. The tooth 42 is now moved out of engagement with the perforation in the disk, and the operation is repeated as many times as necessary.

In order to adjust the position of the radial arm so as to insure its engagement in one of the notches or perforations of the disk when elevated by the arcuate bar 32, said bar carries a depending lug 50, through which extends a set-screw 51, that engages the radial arm as the latter is restored to its initial position. The screw permits of adjustment to an extent sufiicient to insure the engagement of the pin or tooth carried by the arm with one of the perforations.

The construction of the disk is such that ratchet-teeth or similar devices may be substituted for the perforations without departing from the invention.

Usually it is preferred to start with the figures in the right-hand or units column, and after all of the corresponding keys have been depressed to add the column a memorandum is made of the final number and the amount to be carried to the next column, after which the disk is restored to zero position, and after the amount carried over has been first added the figures in the second or tens column are added.

The machine possesses but few parts and is of such simple construction as to require little or no repairs to keep it in proper working order.

Having thus described the invention, What is claimed is 1. The combination with a revoluble disk having an annular row of perforations, of an arm having a pivot-point coincident with the axis of rotation of the disk, a plurality of. approximately radial key-levers, and an arcuate bar under the control of the key-levers and to which the outer end of said arm is connected.

2. The combination with a revoluble adding-disk having an annular row of perforations, of a radial arm having a pin adapted to enter the perforations, approximately radial key-levers, an arcuate bar under the control of said key-levers and to which the outer end of the radial arm is connected, and a disklocking means controlled by said bar.

3. The combination in an adding-machine, of a revoluble adding-disk having an annular row of numerals and provided with a row of perforations of a number equal to the number of numerals, a spring locking-arm having a tooth for engaging the perforations and locking the same from movement, a radially-disposed arm having a pivot coincident with the axis of movement of the disk, said radial arm having a pin or tooth for engaging in said perforations, a series of key-levers extending in an approximately radial line from the disk, an arcuate bar extending across the levers, said bar carrying the outer end of the radial arm, and a portion of said bar being arranged adjacent to the locking-arm whereby on movement of a key-lever into engagement wit-h the bar, the raising of the latter will unlock the disk and raise the radial arm into engagement with said disk.

4. The combination in an adding-machine, of a revoluble adding-disk having an annular row of numerals and provided with a row of perforations equal in number to the number of numerals, a spring tending to rotate the disk, a locking-arm having a pin or tooth for engaging the perforations, a locking-disk, a radially-disposed arm having a pivot eoincident with the axis of movement of the disk and also provided with a perforation-engaging tooth, a plurality of key-levers, and a bar extending over the key-levers, said bar serving as a carrier and a guide for the outer end of the radial arm.

5. The combination in an adding-machine, of a revoluble numeral-bearing disk having a row of perforations, aspring tending to rotate the disk in one direction, a disk-locking arm having a perforation-engaging tooth, a radially-extending arm pivoted at the center of movement of the disk and having a perforation-engaging tooth, an arcuate bar serving as a supporting and guiding means for the outer end of the arm, and a series of key-levers movable into engagement with said bar thereby to effect unlocking of the disk and raising of the radial arm into disk-engaging position, the key-levers serving further as stops for limiting the movement of the arm and disk.

6. The combination in an adding-machine,

of a revoluble numeral-bearing disk having a row of perforations, a spring lockingarm having a perforation-engaging tooth, a spring tending to rotate the disk, a radial arm pivoted at the center of movement of the disk and also having a perforation-engaging tooth or pin,an arcuate bar having outwardly-extended arms pivoted to the frame, said bar serving as a support for the outer end of the radial arm, and a plurality of key-levers movable into engagement with said bar thereby to raise the radial arm into engagement with the disk and effect the release of the locking-arm.

7 The combination in an adding-machine, of a revoluble numeral-bearing disk having an annular row of perforations, a spring tending to rotate the disk, a radial arm pivoted at the center of movement of the disk, an areuate bar having outwardly-extending pivotarms, said arms serving as a guide and support for the outer end of the radial arm. a tooth carried by said radial arm and movable into engagement with the perforations, a series of approximately radial key-levers movable into engagement with the bar and serving as stops for limiting movement of the radial arm, a spring locking-arm having a perforation-engaging tooth, said arm having a depending lug for locking the disk in the path of movement of the bar.

8. The combination in an adding-machine, of a numeral-bearing disk having an annular row of perforations, a spring tending to retate the disk in one direction, a radial arm pivoted at the center of movement of the disk,

an arcuate bar having outwardly-extending pivot-arms, said bar serving as a guide and support for the outer end of the radial arm, a perforation-engaging tooth carried by the radial arm, a plurality of key-levers for engaging said bar and serving as stops for limiting movement of the radial arm, a spring locking-arm having a perloratien-engaging tooth, and an auxiliary pawl carried by the bar and serving by engaging the perforations to prevent reverse movement of the disk.

9. In an adding-machine, an adding-disk, a spring tending to rotate the disk in one direction, means for limiting movement of the disk, a disk-locking means, a disk-releasing means, and an auxiliary disk-locking device movable into engagement with the disk and serving to prevent reverse movement of said disk when the first locking means is disen gaged therefrom.

10. In an adding-machine, an adding-disk, a locking means, means for limiting move- "ment of the disk, means for moving the locking means to initial position, and an auxiliary spring-pressed pawl movable into engagement with the disk when the locking means is released.

In testimony that I claim the foregoing as my own I have hereto al'lixed my signature in the presence of two witnesses.

\Vitnesses:

H. Klmlnnirmn, H. C. Snomnuucn. 

